Guild Wars 2 is one of those holy grail of casual MMO experience. You don't need to stress over a monthly payment to grind to the maximum level, nor do you need to shell out thousands of dollars in cash just to get good gears. While the game has been released for quite awhile now, the game has been maturing quite a bit. End-game content, while a bit controversial at times (supposedly you shouldn't have to grind for top-end gears but there's still a bit of that). Regardless of how you feel, I personally think Guild Wars 2 is one of the more interesting MMOs to come out, and can be a fun experience especially if you have a few close friends to play-through with.
This is sold via GMG, a UK based digital games retailer. If you have trouble buying the game, one other option is US-retailer Gamefly which has the Deluxe Digital Edition. The Heroic Edition includes the Guild Wars 2 Standard Digital Edition and these three special exclusive digital items: